Can you post a couple of pictures of the carburetor setup you have on that 115?
I'd be interested in seeing if the carbs are WMK 14's off a 140/150 I6 Merc. It may well be that you've got the 140 powerhead "Florida Sleeper". I've done that trick twice.
I used to run an '83 140 powerhead on an '81 115 mid-section. I used all the externals from the 115, as it was on the back of a 15' Cacci Craft copy of the V-Mate, and the boat was labeled "Max HP: 115".
I could just touch 85 mph with a 2-blade 32" pitch over-hub solid brass prop at about 6300 rpms. I'll never forget the day it threw the #2 rod out the front of the motor and right through the center of the dash. I think it was several minutes before I really comprehended what had almost happened.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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